Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62d0313f610f8d4…

MALICIOUS

PDF

89.8 KB Created: 2021-07-03 22:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6612a6c9f26792647f789bc7b00d42cc SHA-1: 86adc17ea835aa5a939a1e60c380c004311c0d4b SHA-256: e62d0313f610f8d4f93bcace43784e19059ea1c77adba869e941db2908983cda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's intended to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://exclusivelimoservice.com/ckfinder/userfiles/files/wepogabofopavudutexitufu.pdf In PDF document text
    • https://chmelo.hu/sites/default/files/file/mimipusimidaz.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f2b5e271de45ca74ed2d981b4d05423b/49226783121.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/fac3fbb710fcc75b4acfc321b6c9a778/39268610574.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/tugewuzobajodoxilef.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec82bb50c0---12900005692.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/df36311ff4c6ff035a9200c0554c96d7/falidi.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dd8a84562---xeluwagivutof.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/negumuzibewemezaduzida.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/32199614427.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160985f41ba37a---zatibugagerewid.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/wexafomedokasibe.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160da138401575---52468904833.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5c9f55dd67dd6cf4f11ed939d04a913/fubamipidezitamumodivirur.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/87996747602.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/91b418e4a0e5949407dac23017975249/pujijugum.pdfIn PDF document text
    • http://canadanur.com/resimler/files/sageberazanepikage.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/xudubo.pdfIn PDF document text
    • https://luminex.pl/upload/file/bezobudosemubut.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/moxir.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/c03629cffa3fe7c4bf18c0d98f86b7b5/77038173093.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/e0fb33e982aa1e93efca13a6a008becd/50483973624.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baba6804825---45431161010.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/temes.pdfIn PDF document text
    • https://cooperspick.com/files/namogizidavojoxibufid.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cefe47e23---81566350317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=shake+it+shake+it+like+a+polaroid+picturePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB70 17180 bytes
SHA-256: 71a95fed15387c10a8108281302535ceb7e2341f3e59b915262aae0b8e2c5903
font_01_sfnt_off0001284f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14066 10772 bytes
SHA-256: 7f457bf2a2ae12d1d5c24a576220bc9739a516c9b6797920bd283a16f9d94650